Your website mentions low-latency-execution; how well have you found Haskell can cope with this? Have you run into problems with GC pauses etc? From my experience, major GC collection can be quite large and can't really be avoided...
Haskell can cope well enough. We don't focus on ultra-high frequency trading so much, though we'll take any latency advantages we can get. We focus more on high-level trading strategies. GC pauses are not really an issue. Our system is tuned to avoid doing GC at inopportune times.
I'm curious if you benchmarked Haskell implementations against any C or C++ implementations (especially for market connectivity). Any hint about magnitude of difference?
Could you give some details on how you tweaked the GC?
Did you evaluate OCaml vs Haskell? I'm curious to know what criteria would lead trading firms to consider non-traditional languages yet choose different functional languages?